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The
SB-2 provides an easy installation when you are working
on a tight budget. Supply voltages up to 500Vdc are accommodated, and amplifier power up to 120Wrms. In addition to the Power Scale control, a "drive compensation" pot is also included. The printed circuit board can be broken into two pieces to accommodate the space available. A 28mm mil-spec PS pot is provided as it is a requirement of this simple circuit
design.
The mil-spec PS pot is a critical component, so additional PS pots must also be of this type. Automated switching selection of these is limited to relays.
Proper heat sinking is required. In small amps, such as the Valve Jr., the chassis will suffice as the heat sink. In amps over 20W, it is best to add a fan to cool the chassis. An aluminum heat sink is also a good idea on larger amps.
PCB dimensions: 2.2 x 0.8", 56 x 20mm
splittable into two each 1.1 x 0.8", 28 x 20mm
Kit includes notes with installation tips + layout and schematic diagrams of the kit.
For more info, see "Selecting a Power Scaling Kit".
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